(19)
(11) EP 0 383 307 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.04.1992 Bulletin 1992/14

(43) Date of publication A2:
22.08.1990 Bulletin 1990/34

(21) Application number: 90102903.3

(22) Date of filing: 14.02.1990
(51) International Patent Classification (IPC)5H04N 1/46
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 15.02.1989 JP 35694/89
23.02.1989 JP 44390/89

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventors:
  • Nakai, Takehiko
    Meguro-ku, Tokyo (JP)
  • Setani, Michitaka
    Kawasaki-shi, Kanagawa-ken (JP)

(74) Representative: Tiedtke, Harro, Dipl.-Ing. et al
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4
80336 München
80336 München (DE)


(56) References cited: : 
   
       


    (54) Image reading apparatus


    (57) An image reading apparatus comprises a multiline sensor on which a plurality of linear sensor arrays are arranged on a single substrate, a focusing optical system for focusing an object image on the multiline sensor and a blazed diffraction grating, disposed in an optical path between the focusing optical system and the multiline sensor, for color-separating light from the object into a plurality of light components and guiding the color-separated light components to the corresponding sensor arrays. The grating thickness of the blazed diffraction grating is changed in correspondence with an angle of light incident on the blazed diffraction grating.







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